11 results on '"Liu, Degang"'
Search Results
2. Effect of simulated acid rain on stability of arsenic calcium residue in residue field.
- Author
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Fei, Jiangchi, Ma, Jingjing, Yang, Jinqin, Liang, Yanjie, Ke, Yong, Yao, Liwei, Li, Yuancheng, Liu, Degang, and Min, Xiaobo
- Subjects
ACID rain ,ARSENIC ,ARSENIC compounds ,INDUSTRIAL waste leaching ,CHLORIDE ions ,CALCIUM compounds ,HAZARDOUS wastes ,HEAVY metals - Abstract
In recent years, acid rain had a serious negative impact on the leaching behavior of industrial waste residue. Researches were mainly focused on the environmental hazards of heavy metal in the leachate, but ignored the effects of heavy metal speciation on the stability of waste residue in the subsequent stabilization process. In this study, the unstable calcium–arsenic compounds in the arsenic calcium residue were firstly removed by leaching process; subsequently, the crystallization agent was added to treat the remaining calcium–arsenic mixture. The results of the leaching process demonstrated that the decrease in particle size and pH value directly affected the increase in the cumulative leaching amount of arsenic, and the cumulative leaching ratio reached 1.55%. In addition, the concentration of arsenic decreased from 3583 to 49.1 mg L
−1 . After the crystallization process, the arsenic concentration was lower than the limit value of Identification Standards for Hazardous Wastes (GB 5085.3-2007). The SEM analysis showed the bulk structures, and XRD pattern confirmed that they were the stable compounds. Moreover, the result of XRD and SEM illustrated that acid concentration, chloride ions and sulfate ions were contributed to the transformation and growth of stable calcium arsenate compounds. Therefore, effective control of the acidity of acid rain, the type of anions in acid rain, and the particle size of residues would contribute to adjusting the arsenic speciation to be more stable. The leaching-crystallization process was of great significance to improve the stability of the arsenic-containing residue. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
- View/download PDF
3. Hot Deformation Behavior and Processing Map of a Fe-11Mn-10Al-0.9C Duplex Low-Density Steel Susceptible to κ-Carbides.
- Author
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Liu, Degang, Ding, Hua, Cai, Minghui, and Han, Dong
- Subjects
ISOTHERMAL compression ,STEEL ,LOW temperatures ,HIGH temperatures ,STRAIN rate ,GRANULAR materials ,NIOBIUM compounds - Abstract
The hot deformation behavior of a Fe-11Mn-10Al-0.9C duplex low-density steel has been investigated, based on a series of isothermal compression tests at temperatures of 800-1100 °C and strain rates of 0.001-10 s
−1 . At relatively lower temperatures, with austenite decomposing, continuous dynamic recrystallization of ferrite and the formation of inter-granular κ-carbide were responsible for significant softening. At high deformation temperature where austenite was a dominant phase, dynamic recrystallization (DRX) is the restoration mechanism. Processing maps were developed at different plastic strains employing dynamic materials model and further verified through microstructural characterization. The optimal hot deformation condition at a large strain (0.7) was identified as deformation temperature of 950-1100 °C and strain rate of 0.01-1.0 s−1 . In this domain, the original coarse grains could be replaced by the fine and uniform recrystallized grains, indicating that the high efficiency was dissipated by DRX. Meanwhile, two instable regions resulted from the formation of inter-granular κ-carbides and necklace structure should be avoided during hot processing. [ABSTRACT FROM AUTHOR]- Published
- 2019
- Full Text
- View/download PDF
4. The Interaction of Population, Industry and Land in Process of Urbanization in China: A Case Study in Jilin Province.
- Author
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Liu, Yanjun, Zhou, Guolei, Liu, Degang, Yu, Huisheng, Zhu, Liyuan, and Zhang, Jing
- Subjects
URBANIZATION ,REGRESSION analysis ,DISTRIBUTION (Probability theory) ,URBAN growth ,CITIES & towns - Abstract
Urbanization is a complex process that covers a wide range of topics, of which population, industry and land urbanization are three important aspects. Jilin Province is an important agricultural province in China. The contradiction between population, industry and land urbanization is especially prominent here, and its coupling development is of great practical significance. In this paper, the coupling degree of population-industry-land urbanization in Jilin Province in 1990, 2000 and 2010 is measured by coupling mode. The spatial pattern of the coupling degree is analyzed by trend surface analysis and global and local spatial autocorrelation. The influence factors and their spatial differentiation are discussed using multiple linear regression (MLR) model and geographic weighted regression (GWR) model. The results show that: 1) the coupling degree of population-industry-land urbanization in Jilin Province is at a low level. Judging from the change of time scale, the urbanization of most research units is becoming more and more coordinated. From the comparison of spatial scales, there is significant spatial difference in the research units of different administrative levels. 2) Judging from the global change trend, the coupling degree of population-industry-land urbanization in the central region is higher than that in western and eastern regions. The coordination of urbanization in the central region is relatively good, and the distribution of the cold and hot spots is basically the same as that overall. 3) The spatial pattern of the coupling degree is related to the cold and hot spot distribution of the influence coefficient of urban population density and per capita urban construction land. The variation of the coupling degree spatial pattern is synchronous with the spatial change of the urban population density influence coefficient. 4) The degree of agglomeration of the urban population is the main factor promoting the coupling pattern of population-industry-land urbanization in Jilin Province, and the extent of its influence is gradually increasing. In addition, the level of city administrative, the efficiency of urban expansion and the capacity of market consumption also have an important influence on the coupling pattern. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
5. Study on Formation Mechanism of Fayalite (Fe2SiO4) by Solid State Reaction in Sintering Process.
- Author
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Wang, Zhongbing, Peng, Bing, Zhang, Lifeng, Zhao, Zongwen, Liu, Degang, Peng, Ning, Wang, Dawei, He, Yinghe, Liang, Yanjie, and Liu, Hui
- Subjects
SINTERING ,SILICON compounds ,IRON sulfides ,CHEMICAL reactions ,MAGNETIC separation - Abstract
The sintering behaviors among SiO
2 , FeS and Fe3 O4 were detected to reveal the formation mechanism of Fe2 SiO4 . The results indicated that the formation mechanism is divided into five steps: (1) migration of O2− induced by S2− under a reducing atmosphere; (2) formation of Fe3 O4− ; (3) migration of Fe(II) into a ferrite cluster structure to gain oxygen and form Feβ 3− Ox 4; (4) Fe(II) invaded the silicon atomic position and released Si(IV); and (5) formation of the stable structure of Fe2 SiO4 through chemical diffusion between cations of Fe(II) and Si(IV). These findings can provide theoretical support for controlling the process of the recovery of valuable metals in copper slag through the combined roasting modification-magnetic separation process. [ABSTRACT FROM AUTHOR]- Published
- 2018
- Full Text
- View/download PDF
6. Influential intensity of urban agglomeration on evolution of eco-environmental pressure: a case study of Changchun, China.
- Author
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Liu, Yanjun, Zhang, Jing, Li, Chenggu, Zhou, Guolei, Fu, Zhanhui, and Liu, Degang
- Subjects
URBANIZATION & the environment ,URBANIZATION ,ATMOSPHERIC pressure ,URBAN growth - Abstract
In this paper, we study the interactive relationship between the agglomeration of urban elements and the evolution of eco-environmental pressure. We build an index system for evaluating the agglomeration of urban elements and eco-environmental pressure. Using the entropy method and response intensity model, we analyze how urban elements agglomeration influenced eco-environmental pressure in Changchun from 1990 to 2012, eliciting the changing features and influential factors. Ultimately, we conclude there is a significant interactive relationship between the agglomeration of urban elements and the evolution of eco-environmental pressure in Changchun. This is inferred from the degree of this agglomeration in Changchun having increased since 1990, with the degree of eco-environmental pressure first decreasing and then increasing. Alongside this, the impact of urban elements agglomeration on eco-environmental pressure has changed from negative to positive. The main reasons behind this shift are arguably the rapid growth of urban investment and ongoing urbanization. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
7. Study on Real-Time Vehicle Scheduling Problem to Rescue Victims in Chemical and Biological Terrorist Attacks.
- Author
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Liu, Zhonghua, Wang, Juyun, Yu, Hua, and Liu, Degang
- Published
- 2014
- Full Text
- View/download PDF
8. Discovery and characterization of small molecules that target the GTPase Ral.
- Author
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Yan, Chao, Guin, Sunny, Owens, Charles, Theodorescu, Dan, Liu, Degang, Li, Liwei, Khanna, May, Knabe, William E., Wempe, Michael F., Ross, David, Meier, Jeremy, Hoffman, Brenton, Wysoczynski, Christina L., Jones, David N. M., Nitz, Matthew D., Brautigan, David L., Ahmed, Mansoor, Schwartz, Martin A., Paschal, Bryce M., and Meroueh, Samy O.
- Subjects
GUANOSINE triphosphatase ,TUMOR growth ,CANCER cell analysis ,PROTEIN structure ,CANCER treatment ,NUCLEAR magnetic resonance spectroscopy - Abstract
The Ras-like GTPases RalA and RalB are important drivers of tumour growth and metastasis. Chemicals that block Ral function would be valuable as research tools and for cancer therapeutics. Here we used protein structure analysis and virtual screening to identify drug-like molecules that bind to a site on the GDP-bound form of Ral. The compounds RBC6, RBC8 and RBC10 inhibited the binding of Ral to its effector RALBP1, as well as inhibiting Ral-mediated cell spreading of murine embryonic fibroblasts and anchorage-independent growth of human cancer cell lines. The binding of the RBC8 derivative BQU57 to RalB was confirmed by isothermal titration calorimetry, surface plasmon resonance and
1 H-15 N transverse relaxation-optimized spectroscopy (TROSY) NMR spectroscopy. RBC8 and BQU57 show selectivity for Ral relative to the GTPases Ras and RhoA and inhibit tumour xenograft growth to a similar extent to the depletion of Ral using RNA interference. Our results show the utility of structure-based discovery for the development of therapeutics for Ral-dependent cancers. [ABSTRACT FROM AUTHOR]- Published
- 2014
- Full Text
- View/download PDF
9. Geographic Information Systems Grid.
- Author
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Sloot, Peter M. A., Hoekstra, Alfons G., Priol, Thierry, Reinefeld, Alexander, Bubak, Marian, Feng, Dan, Zeng, Lingfang, Wang, Fang, Liu, Degang, Zhang, Fayong, Qin, Lingjun, and Liu, Qun
- Abstract
GIS Grid (geographic information systems grid) is a combination of geographic information systems and grid technology. Existing non-standardized multi-sources and multi-scales data have a shortage of spatial information shared in either internal and external organizations or departments, especially in national or global applications. It is very important and difficult to store massive spatial data for GIS Grid. And efficient metadata management and data access methods should be studied. At the same time, GIS Grid should provide users with just the services and data they need, without having to install, learn, or pay for any unused functionalities. With the integration of web service and other middleware/toolkit, which support the creation of Grid infrastructures and applications, it is possible to dynamically assemble applications from GIS Grid for use in a variety of client applications. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
10. Test Problem Generator by Neural Network for Algorithms that Try Solving Nonlinear Programming Problems Globally.
- Author
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Liu, Degang and Zhang, Xiang-Sun
- Abstract
A test problem generator, by means of neural networks nonlinear function approximation capability, is given in this paper which provides test problems, with many predetermined local minima and a global minimum, to evaluate nonlinear programming algorithms that are designed to solve the problem globally. [ABSTRACT FROM AUTHOR]
- Published
- 2000
- Full Text
- View/download PDF
11. Computational Method for the SPSD of Dynamic Systems and its Application.
- Author
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Zhao WenLi and Liu DeGang
- Subjects
STRAINS & stresses (Mechanics) ,SPECTRAL energy distribution - Abstract
In this paper, a new method of obtaining the stress power spectral density (SPSD) of a structure that is not through measurement but through imitative computation is presented. First, the dynamic model of a system is established. Then, considering the randomness of the load, the response spectra of the system under different random excitations and parameters are computed by numerical imitation. Last, a concept of unit load stress matrix is put forward. Based on it, the relationship between the SPSD of a structure in a system and the response spectra of the system can be obtained. In particular, the method can be used to compute the SPSD of a new type dynamic structure and to emulate dynamic fatigue life. In the process, an example of the track of a high-speed train is used to compute its SPSD, and the result is used to estimate its fatigue life and to analyze its reliability. [ABSTRACT FROM AUTHOR]
- Published
- 2002
- Full Text
- View/download PDF
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